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China Suppliers Factory of High-Performance Silicon Nitride Bonded Silicon Carbide Bricks for Industrial Applications
Core Advantages
Exceptional High-Temperature Stability
With a maximum service temperature of 1600℃ and refractoriness up to 1750℃, the silicon nitride bonded silicon carbide brick maintains structural integrity and stable performance under long-term high-temperature operation, without deformation or cracking even in extreme thermal environments.
Superior Wear & Corrosion Resistance
High-purity SiC aggregate (content ≥85%) and dense Si₃N₄ bonding phase form a robust structure, which can resist severe wear from high-speed airflow, dust, and molten media, as well as erosion from acidic, alkaline, and reducing atmospheres.
Excellent Thermal Shock Resistance
Low thermal expansion coefficient (3.5-4.5×10⁻⁶/℃) enables the brick to withstand frequent cold-heat cycles (1100℃ water quenching test ≥25 times) without peeling or damage, adapting to intermittent operation equipment.
High Structural Strength & Long Service Life
The unique Si₃N₄ bonding system enhances the brick’s compressive strength (≥35MPa) and flexural strength (≥8MPa), making it not easy to break during installation and use. Its service life is 2-3 times longer than that of ordinary silicon carbide bricks.
Product Parameters
| Item | SiC Brick | Si₃N₄-SiC Brick | |
|---|---|---|---|
| SiC % | ≥88 | ≥80 | ≥72 |
| Si₃N₄ % | / | / | ≥18 |
| Bulk Density (g/cm³) | ≥2.60 | ≥2.58 | 2.60-2.70 |
| Apparent Porosity % | ≤17 | ≤18 | ≤16 |
| Thermal conductivity (1200℃）w/(m.k) | 13.2 | 12 | / |
| Cold Crushing Strength MPa | ≥110 | ≥100 | ≥180 |
| Thermal shock stability（1100℃ cooling) times | ≥50 | ≥40 | ≥30 |
| Refractoriness Under Load ℃（0.2MPa,0.6%） | 1700 | 1700 | / |
Detailed Application Scenarios
1. Metallurgical Industry
Our silicon nitride bonded silicon carbide brick is widely used in blast furnace tuyere sleeves, hot blast stove linings, converter mouth linings, and continuous casting tundish nozzles. This high-temp wear-resistant refractory brick can withstand high-temperature airflow erosion and molten steel scouring, effectively prolonging the service life of key metallurgical equipment and reducing shutdown maintenance time. It is a reliable high-performance refractory solution for harsh metallurgical working conditions.
2. Ceramics & Building Materials Industry
Suitable for ceramic tunnel kiln cars, roller kiln inner linings, glass furnace regenerator checker bricks, and cement rotary kiln tertiary air ducts, our silicon nitride bonded silicon carbide brick resists high-temperature wear and dust erosion. This refractory brick ensures uniform furnace temperature, improves the qualification rate of ceramic, glass, and cement products, and maintains stable performance in long-term high-temperature operation.
3. Petrochemical Industry
Our silicon nitride bonded silicon carbide brick is applied to catalytic cracking reactor linings, reformer tubes, and high-temperature flue gas pipelines. As a corrosion-resistant refractory material, it can withstand the erosion of high-temperature, high-pressure, and corrosive media (such as sulfur-containing gas), ensuring the safe and continuous operation of petrochemical equipment and reducing maintenance costs.
4. Power Industry
Used in circulating fluidized bed (CFB) boiler linings, boiler cyclone separators, and ash discharge pipes, our silicon nitride bonded silicon carbide brick excels in resisting the wear of high-speed fly ash and high-temperature flue gas. This high-temp refractory brick reduces boiler maintenance frequency, improves power generation efficiency, and is a cost-effective choice for power plants.
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Frequently Asked Questions (FAQ)
What is a Silicon Nitride Bonded Silicon Carbide Brick?
It is a high-performance refractory material composed of high-purity silicon carbide (SiC) and silicon nitride (Si₃N₄) as the bonding phase. This combination provides exceptional mechanical strength, thermal stability, and resistance to chemical corrosion.
What is the maximum service temperature of Si₃N₄-SiC bricks?
These bricks feature a maximum service temperature of up to 1600℃ and a refractoriness under load limit reaching up to 1750℃, maintaining structural integrity under extreme thermal conditions.
How does its thermal shock resistance compare to ordinary refractory bricks?
Due to its very low thermal expansion coefficient (3.5-4.5×10⁻⁶/℃), it can withstand frequent rapid cooling and heating cycles (1100℃ water quenching test ≥25 times) without peeling or cracking.
In which industries are these bricks primarily applied?
They are extensively used in the metallurgical industry (blast furnaces), ceramics and building materials (kilns and regenerators), petrochemical industry (reactors and flue gas lines), and power industry (CFB boilers and cyclone separators).
Does this brick offer corrosion resistance against acids and alkalies?
Yes. The dense Si₃N₄ bonding phase and high SiC content provide excellent chemical resistance, protecting the brick from erosion in acidic, alkaline, and reducing atmospheres.